Added a comment on how the strange code handling required came to be.

flask_bootstrap/templates/bootstrap/wtf.html

@@ -31,6 +31,8 @@
                     horizontal_columns=('lg', 2, 10),
                     button_map={}) %}
 
+{# this is a workaround hack for the more straightforward-code of just passing required=required parameter. older versions of wtforms do not have
+the necessary fix for required=False attributes, but will also not set the required flag in the first place. we skirt the issue using the code below #}
 {% if field.flags.required and not required in kwargs %}
 {% set kwargs = dict(required=True, **kwargs) %}
 {% endif %}